unimpeachable

  1. completely acceptable; not open to exception or reproach

    Synonyms : unexceptionable
  2. free of guilt; not subject to blame

    Synonyms : blameless, inculpable, irreproachable
    Examples :
    • an unimpeachable reputation
  3. beyond doubt or reproach

    Examples :
    • an unimpeachable source

unassailable

  1. without flaws or loopholes

    Synonyms : bulletproof, unshakable, watertight
  2. immune to attack; incapable of being tampered with

    Synonyms : impregnable, inviolable, secure, strong, unattackable
  3. impossible to assail

    Synonyms : untouchable

unstinting

  1. very generous

    Synonyms : lavish, munificent, overgenerous, too-generous, unsparing, unstinted
    Examples :
    • called for unstinting aid to Britain

unflappable

  1. not easily perturbed or excited or upset; marked by extreme calm and composure

    Synonyms : imperturbable
    Examples :
    • unflappable in a crisis

untenable

  1. (of theories etc) incapable of being defended or justified

    Synonyms : indefensible

unpropitious

  1. not propitious

    Antonyms : propitious

uncanny

  1. suggesting the operation of supernatural influences

    Synonyms : eldritch, unearthly, weird
    Examples :
    • stumps...had uncanny shapes as of monstrous creatures
  2. surpassing the ordinary or normal

    Synonyms : preternatural
    Examples :
    • his uncanny sense of direction

unseemly

  1. not in keeping with accepted standards of what is right or proper in polite society

    Synonyms : indecent, indecorous, unbecoming, uncomely, untoward
    Examples :
    • unseemly to use profanity

uncompromising

  1. not making concessions

    Synonyms : inflexible, sturdy
    Antonyms : compromising
    Examples :
    • took an uncompromising stance in the peace talks
    • uncompromising honesty

urbane

  1. showing a high degree of refinement and the assurance that comes from wide social experience

    Synonyms : polished, refined
    Examples :
    • maintained an urbane tone in his letters